Phathead sets, with their interchangeable combustion chambers, allow you to easily customize your motor’s power band. All Phathead sets include a Phathead body, two domes (combustion chambers) o-rings, coolant hose fittings, head nuts, copper washers, all necessary hardware and installation instructions. The Phathead sets include one dome closest to stock compression and one dome the next step higher.

Phathead Racing Heads Honda Dirt bike

Kawasaki Dirt bike

Suzuki Dirt bike

Yamaha Dirt bike . . . . Yamaha ATV

KTM Dirt bike